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A new superconducting transistor has been investigated, both theoretically and experimentally. The device has a current gain of 10 and an estimated power-delay product of 90 aJ. It is shown that in principle, the gain of the device is limited only by its length. Possible applications include analog amplification and digital logic.

We present an overview, mainly of worl< in our laboratory, of low-threshold GaAs/AIGaAs quantum-well laser diodes and GaAs metalsemiconductor-metal photodetectors-two optoelectronic devices which show good promise for use in computer-related communication. Present-day telecommunication device technology (based on InP materials) is not well suited to the requirements of optical data communication among and within computers because the computer environment is much more demanding. It imposes a higher ambient temperature on the devices, and requires denser packaging and smaller power dissipation per device, as well as a high degree of parallelism. The GaAs/AIGaAs device technology is ideally suited to this task because

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